Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2007, No.4
/ Publications / Scientific Journals
Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2007, No.4
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Proceedings of the National Academy of Sciences of Belarus
(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF PHYSICAL-ENGINEERING SCIENCESPublished by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Number 4, 2007
CONTENTS
MATERIALS ENGINEERING, METALLURGY
Marukovich E. I., Stetsenko V. Ju.
Thermodynamics of nanocrystals in melts. pp. 5--12
Summary: It is shown, that the basic of thermodynamics of nanocrystals in melts is the fact, that interphase surface tension on the boundary of liquid metal with nanocrystals is linearly dependent on its radius. This seriously decreases interphase surface tension of nanocrystals and makes them thermodynamically stable in the melt.
Byeli A. V., Kukareko V. A.
Low-energy ion implantation at high current densities and nano/amorphous structures synthesis in Fe-based alloys. pp. 13--20
Summary: A brief
Summary: of the recent progress concerning the understanding of mechanisms responsible for ion beam induced amorphization and nanostructure formation in alloys subjected to low-energy nitrogen ion implantation at high-current-densities is presented. The discussion is concentrated on a number of Fe-based alloys. Several mechanisms including deposition from the near surface plasma "cloud", amorphization by solid-state reaction, cellular precipitation in solid solutions, etc. are considered to explain the formation of nano- and amorphous structures.
Dmitrochenko V. V. †, Akhmadieva L. V.
Technological aspects of tribotechnical coatings formation based on mixed matrices. pp. 21--24
Summary: Application efficiency of composites based on mixed olygomer-olygomer matrices for coatings, which are used in limited lubrication conditions or without lubrication is studied. The influence of polymeric (PTFE, ÑPD) and mineral (graphite, tripoli) fillers on friction coefficient and linear wear of coatings from composites based on mixed matrices is studied.
Malamatov A. Kh., Kozlov G. V., Burya A. I., Kudina E. F., Mikitaev A. K.
Melt viscosity of nanocomposites based on high density polyethylene. pp. 25--27
Summary: It is shown, that the extreme change of melt viscosity of polyethylene-epoxy polymer nanocomposites can by correctly described within the flamework of fractal model. The main structural factor, controlling this effect, is change of fractal dimension of macromolecular coil in melt. The main physical cause, determining the effect, is partial interaction of polyethylene matrix and epoxy particles.
MECHANICAL ENGINEERING AND MECHANICS
Vysotski M. S., Doubovik D. A.
Differential of a free motion with the improved characteristic of blocking properties. pp. 28--35
Summary: The constructive scheme of differential of a free motion with the improved characteristic of blocking properties is developed. Calculation research is executed and analytical dependences of an efficiency of running system and a parameter of steerability of the off-road vehicle MZKT-79091 with the wheel formula 8×8 with various types of a drive of driving wheels of third and fourth axles from an average steering angle of steerable wheels of first axle are established.
Klubovich V. V., Tamila V. A., Kravchuk A. S., Sushko I. C., Kazak M. M.
Periodic profiles in flat protective elements of of ploughs cages. pp. 36--39
Summary: The design and service conditions of flat protective elements of ploughs cages is analysed. It is offered to replace the protective element consisting of constant thickness strips by two variable profile strips. Results of a profile strips calculation with use of program LS-Dyna are presented.
Klubovich V. V., Tamila V. A., Khruschov E. V.
Ways of fatigue durability increase of elastic elements of automobile suspension brackets. pp. 40--46
Summary: Ways of durability increase of elastic elements on automobile suspension brackets are considered. The phenomena occuring at superficial plastic deformation are described. New devices in which energy of ultrasonic fluctuations is used for hardening plates of springs are offered.
Starovoytov E. I., Abu Halava Mohammad
Bending of ring sandwich plate on elastic foundation under local loading. pp. 47--52
Summary: Bending of ring sandwich plate with light filler lying on elastic foundation is considered. The load is local. For the description of kinematics of package with asymmetrical thickness the broken normal hypothesis was accepted. Reaction of foundation was described on the base of Winkler’s model. Combined equations of equilibrium and analytical solutions via displacement were obtained. Numerical solutions for sandwich metal-polymeric plate were adduced.
Dokukova N. A., Kaftaikina E. N., Levkovski A. A.
Investigations on deformation and impact of material bodies with inclined vibrating surface. pp. 53--56
Summary: The non-central impact condition of solid body by beam accomplishing back-and-forth motion was deduced. New formulae for dynamic beam deflection in the place of contact with falling solid body were deduced. The solution of S. P. Ti-moshenko non-elastic impact problem obtained using generalized delta function was shown.
Grudanov V. Ya., Brench A. A., Hodakova S. N.
Development and introduction of new cutting tools of machines for crushing meat raw materials. pp. 57--61
Summary: The interrelation of the power parameters describing process of primary crushing and deterioration, with design features of knifes and lattices is established. For the first time the generalized characteristic of rotating knife, establishing its design data is deduced. On the basis of the generalized characteristic the settlement model of a rotating knife with the displaced cutting edge and an inclined forward side of each tooth is developed.
Experimental pre-production models of the cutting mechanism which have successfully passed industrial tests are created. Introduction in manufacture of the cutting tool of a new design allows essentially raising the efficiency of process of crushimg of meat raw material, considerably lower operational expenses due to increase of wear resistance of the cutting pair a knife-lattice, increase productivity of the machine as a whole at stability of power inputs. Wear resistance of the cutting pair a knife -- lattice in 1.4--1.5 times surpasses stability of the serial cutting tool of tops and meat grinders.
Rukteshel O. S., Vershina G. A., Pilatov A. Yu.
Thermodynamic analysis of average equilibrium concentrations of nitric oxide NOx based on temperature field of the space within a cylinder of a high-powered diesel engine. pp. 62--72
Summary: We elaborated the thermodynamic regularity that allows determining the content of nitric oxide in the waste gas of the high-powered diesel engine. The content of toxic constituents in the waste gas, and nitric oxide NOx in particular, was determined on the basis of equilibrium concentration that was estimated by the equilibrium constant of chemical reactions taking into account temperature field in the cylinder space.
POWER ENGINEERING, HEAT AND MASS TRANSFER
Antukh A. A., Vasiliev L. L., Filatova O. S.
Tri-generation systems with sorption heat pumps. pp. 73--78
Summary: Tri-generation systems, systems of electricity, heat and cold production, are the effective devices, which are capable to transform energy from an alternative sources and to use fuel transformation at low temperature. Adsorption heat pump consisting of three different adsorbers (on the basis of active carbon fiber saturated with chlorides of nickel, manganese, barium) and evaporator/condenser with ammonia could function in several regimes and could have one or two sources of cold. Working characteristics of heat pump, cold production in both regimes and coefficients of permeability (COP) are obtained.
INFORMATION TECHNOLOGIES AND SYSTEMS
Haber P. N., Sadykhov R. Kh.
Image compression algorithms and technologies. Part II. Fractals and wavelets for image compression. pp. 79--94
Summary: The second part of the survey presents the most modern and perspective lossy image compression technologies. These are fractal and wavelet based image compression techniques.
The first part of the article is devoted to image compression technique using fractals. The key theoretical concepts, practical approaches, quality and speed estimations, perspectives are discussed in this part. In the second part wavelet based image compression technology is presented. The discussion goes about theoretical backgrounds, practical implementations and approaches of this the most perspective present-day technique.
RADIOELECTRONICS AND INSTRUMENT MAKING
Hurlo Yu. E., Dzisiak A. B., Gusinskiy A. V., Kostrikin A. M.
Spectrum analyzer SA of 0.01-178.40 GHz. pp. 95--100
Summary: Millimeter wave measurement laboratory of BSUIR develops microwave instrumentation, equipment and devices. At execution of various kinds of works there is a need for investigation of spectrum of complex signals with use of wideband spectrum analyzers.
As a result of modernization of C4-60A analyzer the low-frequency system of data processing and measurement data displaying is replaced with a new digital system including 16 bit high speed block of analog-to-digital converters, USB-GPIB controller, interfaced device, power source and industrial personal computer.
The main element of measurement system modernization is a developed specialized software package including algorithm of automatic management of all functional blocks of the system, calibration algorithms which use built-in quartz oscillators and external reference sources.
The SA spectrum analyzer is manufactured from modern elements, works as fully-automated device and has improved metrological characteristics.
Voropaev Yu. P., Mesherjakov I. M., Vasilev A. D.
Application of mean harmonic value of power transformation factor at wide-band matching of complex resistances by the method of reactive component compensation. pp. 101--107
Summary: Simple analytical parities for calculation of parameters of three types of elementary jet two-port networks, optimum by criterion of the maximal average harmonious value of factor of transformation of capacity are deduced. Techniques of their use are considered at synthesis of broadband agreeing devices with bilaterial complex loadings. Techniques are applicable at any complex resistance of loadings and are free from an error of their approximation in any band of frequencies of the coordination.
DIAGNOSTICS AND SAFETY OF TECHNICAL AND ENVIRONMENT SYSTEMS
Gorbachuova N. V., Molodykh V. G., Sharovarov G. A.
Radionuclide balance of the Chernobyl accident. pp. 108--112
Summary: An integrated investigation of the radionuclide balance of the Chernobyl catastrophe in different moment had been carried out. Radionuclide composition formation of the fuel of the 4-th Unit of the Chernobyl NPP and its radiation characterizations under normal operation had been calculated. Total activity for 650 fission products and 58 actinides have been calculated and its behaviour during the reactor runaway had been investigated. Total energy balance of the accident and its quantity, that influenced to the radionuclide release (filtration flux to an atmosphere), have been carried out. Then radionuclide balance of the accident had been obtained. The distributions of fission products and actinides between the broken reactor and an environment had been calculated. On the base of the nuclide activity balance at the moment of the accident, current nuclide activities in environment and in the broken reactor and for 50-year perspective, as well, had been calculated.
Matyuk V. F., Osipov A. A., Streliukhin A. V.
Accounting of the magnetic properties of a material with determining the central demagnetization coefficient of hollow cylindrical bars. pp. 113--120
Summary: On the basis of notion of fictitious magnetic charges and an empirical expression for magnetization distribution along the surface of a solid cylindrical bar the expression for calculation of the central demagnetization coefficient of hollow cylindrical bars taking into account magnetic permeability has been obtained. The comparison between calculation results and experimental data for bars with different sizes and different values of magnetic permeability has been carried out. The estimation of magnetic permeability value of a material exceeding which does not influence the demagnetization coefficient has been given.
SCIENTISTS OF BELARUS
Valentin Alekseevich Borodulya (On his 70th birthday). pp. 121--122
Click here to read this article in Russian (Win1251)
Dragun V. L.
The A. V. Lykov Institute of Heat And Mass Transfer is 55. pp. 123--124
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